<!DOCTYPE html>
<html>
	<head>
		<title>reader</title>
		<meta charset="utf-8" />
		<script type="text/javascript">
			function showText(id) {
				var node = document.getElementById(id);
				node.style.display = "block";
			}
			window.onclick = function(e) {
				if(e.target.id == "hello")
					return;
				var node = document.getElementById("node");
				node.style.display = "none";
			}
		</script>
	</head>
	<body>
		<mark id="hello" onclick="showText('node')">hello</mark> world!
		<div id="node" style="display:none">《不能说的秘密》</div>
	</body>
</html>